Provided you are logged in under the same username account that purchased the upgrades, you can disable auto-renew Dashboard > Store > My Upgrades > Disable auto-renew

To cancel a domain you registered with WordPress.com, please log into your account, then go to Store → My Upgrades and use the “Cancel” link in the Subscription Status column. If it’s more than 2 days past the purchase date, you will not receive a refund, but the domain can still be canceled by Staff. I tagged this thread for their assistance. Please subscribe to it so you are notified when they respond.

I do have another account/domain name which the Upgrade was purchased under/for: moirablincoephotography.com

I have followed the instructions that timethief (above) posted to cancel, but nothing seems to work on the page/submission. It says I'm supposed to receive a confirmation email from WordPress - but I haven't.

This renewal of Upgrade fee was bought to my attention by my Bank, as they called me to query if I'd made a purchase for said amount (US$99). As I hadn't, we delved further in to it and found the renewal.

I don't want this annual debit anymore!

There must be someway to cancel this, otherwise the Bank will have to take action.